Seasonal Changes in Numbers and Distribution Patterns of Pine Bark Weevils (Shirahoshizo spp.) (Coleoptera Curculionidae) Attracted to Pine Bait Logs

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The seasonal changes in number of adults attracted to Japanese red pine {Pirns den-siflora) bait logs were observed for the pine bark weevils, Shirahoshizo spp. (including S. pini, S. rufecens and S. insidiosus). From the dissection of the males collected on bait logs, almost all were S. rufecens. The ratio of the number of adults in copulation to the total number observed on the bait log indicated that the adults of Shirahoshizo spp. seemed to copulate more frequently on thick bark conditions than thin bark ones. Flying weevils were attracted for about one and one-half months. The seasonal changes in number of attracted adults on each bait log showed some similarities among some bait logs. The correlation coefficients of these fluctuation patterns between each bait log were calculated. Although the attracted patterns in a group of logs resembling their bark conditions showed similar trend, the dendrogram of these coefficients showed remarkable differences among log groups in these patterns. The contagious distribution pattern of the accumulated number of adults on bait logs showed that the log with thin bark had some unfavourable parts on the surface that the adults avoided in favor of other parts.

Original languageEnglish
Pages (from-to)367-373
Number of pages7
JournalApplied Entomology and Zoology
Issue number4
Publication statusPublished - 1981
Externally publishedYes


ASJC Scopus subject areas

  • Insect Science

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